Steam-engine-noise generator

Circuits for making
audible sound effects
stored in an rc are
nothing special any
more these days. A
disadvantage of many
of them is, however,
that they are normally
far too large to be
built into the model
appliance they are to
imitate. The dimensions
of the generator
described in this article
are such that it
can be built into a
model locomotive
size H0 without too
much difficulty.

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